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教学内容:用提取公因式法分解因式。一、创设情境,导入新课[想一想]科学家通过实验发现:一种名为“木兰E3”的连接酶,可以抑制癌细胞扩散所需的核蛋白。实验室中成年白鼠肝部原有癌细胞230个,介入连接酶治疗240个小时以后,癌细胞成功缩减为228个。这次试验癌细胞缩减了多少个?(结果仍然用含有2n的式子表示)[设计意图]通过介入连接酶治疗后癌细胞数量的变化,创设问题,在学生感到新奇而又不知所措的过程中激发学生强烈的求知欲,
Teaching content: factoring factor extraction with public factor method. First, the creation of the situation, into a new lesson [think] scientists discovered through experiments: a called “Mulan E3 ” ligase, can inhibit the proliferation of cancer cells required for nuclear proteins. In the laboratory, there were 230 original cancer cells in the liver of adult white mice. After 240 hours of interventional ligase therapy, the number of cancer cells was reduced to 228 successfully. The number of cancer cells reduced in this experiment? (The results are still expressed with the expression of 2n.) [Design Intent] Changes in the number of cancer cells after interventional ligase treatment create problems that students feel strange and overwhelmed In the process to stimulate students’ strong curiosity,